/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package servlet;

import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Singleton;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import listener.MyGuiceServletConfig;
import model.Command;
import model.CommandRunner;
import model.PipeLineCommand;
import model.Executable;

/**
 *
 * @author pyin
 */
@Singleton
public class ParseCommandServlet extends HttpServlet {


    private Command command;
    private PipeLineCommand pipelineCommand;
    private CommandRunner commandRunner;
    private Injector injector;


    @Override
    public void init(ServletConfig config) throws ServletException{
        super.init(config);
        ServletContext context = config.getServletContext();
        Injector injector = (Injector)context.getAttribute(MyGuiceServletConfig.KEY);
        injector.injectMembers(this);
        //pass in the injector
        this.injector = injector;
    }

    @Inject

    public ParseCommandServlet(PipeLineCommand pipelineCommand, Command cmd, CommandRunner commandRunner) {
        this.pipelineCommand = pipelineCommand;
        this.commandRunner = commandRunner;
        this.command = cmd;
    }



    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            /* TODO output your page here
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet ParseCommandServlet</title>");  
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet ParseCommandServlet at " + request.getContextPath () + "</h1>");
            out.println("</body>");
            out.println("</html>");
             */
        } finally {
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        PrintWriter out = response.getWriter();
        String command = request.getParameter("cmd");
        Executable cmd = parseCommand(command);
        cmd.setCmd(command);
        commandRunner.addCommand(cmd);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

    private Executable parseCommand(String cmd) {
        if (cmd.contains("|")) {
//            return new PipeLineCommand(cmd);

            return this.injector.getInstance(PipeLineCommand.class);
        } else {


//            return new Command(new TestScriptManager(), new CommandResultManager(), cmd);
//            return Guice.createInjector(new MyModule()).getInstance(CommandFactory.class).create(cmd);
//            return Guice.createInjector(new CommandModule(cmd)).getInstance(Command.class);

            return this.injector.getInstance(Command.class);

//            return null;


        }

    }
}
